Just bought my first 'Benz, she's a '77 300D (diesel). What is the toggle switch just to the right of the sunroof switch? The symbol on it looks similar to the glow-plug icon on the dashboard. Speaking of the dash, what's the light with the circle within a circle with three "dashes" on each side of the circle?

As you may have guessed, it didn't come with an owner's manual. I was hoping to find a younger vintage 'Benz diesel wagon, but I figured I'd start with this. I don't even mind the slower speeds, cruising in style.